矮化板栗表型特征及早期鉴定

通过对2个矮化型和6个乔化型板栗品种发育枝的枝皮率、尖削指数、节间长度、年生长量4个因子的调查分析，发现发育枝枝皮率，尖削指数、年生长量3个因子与树高存在显著相关性，即枝皮率≥19％，尖削指数≥55％时为矮化型，反之为乔化型。通过验证，确定了枝皮率19％、尖削指数55％为板栗矮化型与乔化型的临界参数。并建立Y＝458．4538－11．7191X1－1．0156X2，4年生树高（Y）与嫁接当年发育枝枝皮率（X1）、尖削指数（X2）相关的多元回归方程，可用该方程对矮化型板栗品种进行早期鉴定。

Phenotypic characteristics and early identification of dwarf chestnut cultivars

Fourfactorsi.e.therateofcortex/wood ,taperindex ,lengthofinternodeandannualgrowthofdevelopmental branchesof 2dwarfand 6standardchestnutcultivarsweremeasured .Itwasfoundthatthereexistedsignificantcorrelation amongtreeheight,rateofcortex/wood ,taprterindex ,andannualgrowth .Itwasfurtherverifiedthatthecriticalparame tersofdwarfchestnuthadbeenestablishedwhentherateofcorter/woodamountedto 1 9%andtaperindexto 55% . StatisticregressionY =4 58.4 538-1 1 .71 91X1-1 .0 1 56X2 wasestablished,whereYwasheightoffour-yearoldtree, X1beingrateofcortex/wood ,andX2 taperindex .Itwouldbeusedtoearlyidentifydwarftypesofchestnutcultivars .